This is gay, from time to time the damn engine light comes on and I have no idea what is causing it. It sucks too b/c if messes up my power curve. I still have the top end but my low to mid range power goes to crap... then after a day or so the light goes off and the problem is gone. One of my buddies told me that it could be the O2 sensor, but I don't know if he is right and what else it would be. I just hope it isn't expensive like the valve body was. Does anyone know if the O2 sensor could be the problem, and what else could do it... and how much I am looking at?